The polarization - dependent diffraction characteristics of the metallic echelle and the total internal reflection ( tir ) types of diffraction gratings are studied, and optimal design method based on the hybrid diffractionmethod is presented

Abstract : the petrologic characteristic and the pore types of y8 y10 reservoir are studied by x - ray diffractionmethod, the quantitative mineral clay analysis method and thin - section analysis method. based on the study, the mistakes are corrected in the naming of the sandstone and in the composition of the pore filling substance. the pore characteristic of the sandstone and the main factors of controlling the pore development are discussed